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Marshmallow Test

The famous marshmallow test, with the results that kids who were able to delay their gratification performed better academically leads me to wonder:

If we admitted kids to school based on the marshmallow test rather than birthdate, would kids be able to at least *begin* their academic experience without being at a cognitive disadvantage, and presumably without adults correcting their behavior so often that their emotional association is that school oppressive? In other words, is this another case where correlation doesn't imply causality?